跟-构网变换器并网系统的同步视角交互稳定机理分析

doi:10.16183/j.cnki.jsjtu.2023.231

摘要/Abstract

摘要：

针对跟网型与构网型并网变换器系统的小扰动同步失稳问题,提出一种兼顾机理分析直观性和多机判稳准确性的同步视角频域建模与分析方法.建立考虑跟网型、构网型变换器和传输网络的节点导纳矩阵,基于频域模态法评估系统的失稳特性,在振荡源处划分同步前向和反馈通路,形成计及各变换器和传输网络动态的同步视角稳定分析模型.最后,基于典型两机异构系统验证所提方法的正确性,解决由反馈通路聚合引起的判稳失效问题,直观揭示跟网、构网异构同步动态的交互失稳机理和多参数影响.

关键词: 同步稳定, 并网变换器, 跟网型控制, 构网型控制, 频域模态法

Abstract:

Aimed at the small-signal synchronization instability of grid-following (GFL) and grid-forming (GFM) converter system, a synchronization perspective frequency-domain modeling and analysis method is proposed, which can intuitively reveal mechanism and accurately judge multi-machine stability. Specifically, a node admittance matrix considering GFL, GFM converters, and the transmission network is established. Then, the frequency domain modal analysis (FMA) method is adopted to evaluate system instability characteristics. Afterwards, synchronization forward and feedback paths are partitioned at the oscillation source to formulate a synchronization perspective stability model incorporating dynamics of each converter and transmission network. Finally, the proposed method is validated by using a typical two-machine GFL-GFM system. With such method, the stability judgment failure caused by the feedback path aggregation is addressed, and the interaction mechanism between GFL and GFM synchronization dynamics as well as their parameter influences are revealed.

Key words: synchronization stability, grid-connected converter, grid-following (GFL) control, grid-forming (GFM) control, frequency domain modal analysis (FMA) method

中图分类号:

TM712

宗皓翔, 张琛, 鲍颜红, 吴峰, 蔡旭. 跟-构网变换器并网系统的同步视角交互稳定机理分析[J]. 上海交通大学学报, 2025, 59(2): 151-164.

ZONG Haoxiang, ZHANG Chen, BAO Yanhong, WU Feng, CAI Xu. Frequency-Domain Modeling and Synchronization Perspective Interaction Mechanism of GFL-GFM Converter System[J]. Journal of Shanghai Jiao Tong University, 2025, 59(2): 151-164.

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系统	参数	取值
跟网型变换器	交流滤波器电阻/μΩ	0.2
	交流滤波器电感/μH	3.24
	直流侧电容/mF	25
	控制延时/μs	100
构网型变换器	交流滤波器电阻/μΩ	0.33
	交流滤波器电感/μH	5.4
	直流侧电容/mF	41.8
	控制延时/μs	100
变压器T1	功率/MW	100
	电阻(p.u.)	0.02
	漏感(p.u.)	0.1
变压器T2	功率/MW	60
	电阻(p.u.)	0.02
	漏感(p.u.)	0.1
变压器T3	功率/MW	200
	电阻(p.u.)	0.02
	漏感(p.u.)	0.12